Train Man: A Shoujo Manga(2005)

Densha Otoko: Bijo to Junjou Otaku Seinen no Net Hatsu Love Story

Geeky fanboy Ikumi Saiki has a dream that someday, somehow, he'll finally get a girlfriend. Then one day, on the train home, he rescues a beautiful girl from a troublesome drunk. Now the girl sees the hero inside the otaku -- and it appears that Ikumi will finally find romance! But though Ikumi found the courage to save her, will he ever be brave enough to win her heart? Desparate, Ikumi posts an urgent plea on an Internet message board: "Help me with the girl of my dreams!" Ikumi's story ignites the whole online world. Everyone is ready to help Ikumi prove that even an otaku can find true love!

(Source: Del Rey)